JP5724431B2 - Span loss monitoring system and span loss monitoring method - Google Patents

Description

  The present invention is a system for monitoring a span loss of a transmission line in a WDM (Wavelength Division Multiplex) transmission apparatus.

  In WDM systems, it is necessary to adjust the input level of the receiving optical amplifier within the operating range at the time of initial construction or when switching the transmission line after operation, and the level fluctuation caused by the transmission line that affects the main signal. Therefore, it is important to measure and monitor the span loss of the transmission line.

  Since the input / output level constantly fluctuates within a certain range, the correct span loss cannot be measured unless the maintainers of the upstream station apparatus and the downstream station apparatus measure and compare the levels at the same timing. Therefore, in general, in order to measure the span loss, a maintenance person enters both the upstream station and the downstream station, and the output level of the upstream station apparatus and the input level of the downstream station apparatus are respectively Each level is checked by the level monitor function installed in the device, and the procedure is compared manually. In addition, if the main signal is affected by fluctuations in the transmission line level during operation, the level monitor values are read and compared manually at the upstream station and downstream station devices to confirm the change. I have confirmed.

  On the other hand, an invention for controlling the output level of an optical amplifier on the receiving side of a WDM system has been proposed (for example, see Patent Document 1). The WDM system of Patent Document 1 includes a transmission-side optical transmission device and a reception-side optical transmission device, and operates as follows. The transmission-side optical transmission device transmits wavelength number information of the signal light to the reception-side optical transmission device using OCS (Optical Supervision Channel) light. The receiving-side optical transmission apparatus uses the received OCS light to detect an abnormality in the transmission path and an increase / decrease in the number of wavelengths multiplexed in the WDM light, and adjusts the attenuation amount of the optical signal during reception according to the detection result. .

JP 2007-104103 A

  As described above, since the span loss is confirmed manually by comparing the upstream station and the downstream station, there is a lot of labor and simplification is desired, and accurate monitoring is a problem.

  The WDM system of Patent Document 1 does not consider the timing for measuring the level of the optical signal, and does not disclose a configuration for measuring the level of the optical signal of the upstream station and the downstream station at the same time. For this reason, since the WDM system of Patent Document 1 cannot measure the optical signal levels of the upstream station and the downstream station at the same time, it cannot accurately measure the span loss.

  Accordingly, an object of the present invention is to enable accurate measurement of span loss with less human labor.

The span loss monitoring system according to the present invention includes a wavelength division multiplexed signal and a monitoring signal, a multiplexing unit that multiplexes the input wavelength multiplexed signal and the monitoring signal, and an output of the combined light from the multiplexing unit. An output level monitor unit that measures and outputs a level and outputs the combined light to a transmission line, a time stamp that detects a measurement time of the output level monitor unit, and associates the detected output level measurement time with the output level A monitoring signal transmission device comprising: a generation unit; and a monitoring signal generation unit that generates the monitoring signal including a set of the output level measurement time and the output level associated with the time stamp generation unit, and the transmission line An input level monitor unit that receives the combined light and measures an input level of the combined light; and a monitoring signal that receives the monitoring signal included in the combined light And the end portion, and detects a measurement time of the input level of the input level monitoring unit, the detected input level measurement time and in association with the input level stored, included in the monitoring signals received in the monitoring signal terminator extracting the output level measurement time and the output level, it has a supervisory signal receiving apparatus, comprising, a span loss calculation unit for calculating a difference between the input level and the output level at the same time, the output level monitoring unit Measures the output level at a fixed cycle, the input level monitor unit measures the input level at the fixed cycle, and the measurement start timings of the output level monitor unit and the input level monitor unit are the same time. .

The supervisory signal transmitter of the present invention is the supervisory signal transmitter provided in a span loss monitor system in which a supervisory signal transmitter and a supervisory signal receiver are connected via a transmission line, the supervisory signal transmitter being a wavelength multiplexed signal. And a monitoring signal, and a multiplexing unit that multiplexes the input wavelength division multiplexed signal and the monitoring signal, and an output level of the combined light from the multiplexing unit is measured and output, and the combined light and the transmission path output level monitor section for outputting the output level to detect the measurement time of the monitor, and the time stamp generating unit and the output level measurement time of detection relating the output level, the association of the time stamp generating unit equipped with a monitoring signal generating unit that generates the monitoring signal including a set of the output level measurement time and the output level, the monitoring signal receiving apparatus, prior to The combined light is input from a transmission line, an input level monitoring unit that measures an input level of the combined light, a monitoring signal termination unit that receives the monitoring signal included in the combined light, and the input level monitoring unit An input level measurement time is detected, the detected input level measurement time and the input level are stored in association with each other, and the output level measurement time and the output level included in the monitoring signal received by the monitoring signal termination unit are extracted. A span loss calculation unit that calculates a difference between the input level and the output level at the same time, the output level monitor unit measures the output level at a fixed period, the input level monitor unit, The input level is measured at the fixed period, and the measurement start timings of the output level monitor unit and the input level monitor unit are the same time .

The supervisory signal receiver of the present invention is a supervisory signal receiver provided in a span loss monitor system in which a supervisory signal transmitter and a supervisory signal receiver are connected by a transmission line, wherein the supervisory signal transmitter is a wavelength multiplexed signal. And a monitoring signal, and a multiplexing unit that multiplexes the input wavelength division multiplexed signal and the monitoring signal, and an output level of the combined light from the multiplexing unit is measured and output, and the combined light An output level monitor unit that outputs the output level to the transmission line, a time stamp generator that detects a measurement time of the output level monitor unit, associates the detected output level measurement time with the output level, and associates the time stamp generator A monitoring signal generating unit that generates the monitoring signal including a set of the output level measurement time and the output level, and the monitoring signal receiving apparatus includes: Multiplexed light is inputted from the transmission path, the input level monitoring unit that measures an input level of the multiplexed light, wherein the monitor signal termination unit for receiving the monitoring signal included in the multiplexed light, wherein the input level monitoring unit detecting a measurement time of the input level, the detected input level measurement time and in association with the input level stored, extracts the output levels measured time and the output level included in the monitoring signals received in the monitoring signal terminator A span loss calculation unit that calculates a difference between the input level and the output level at the same time, the output level monitor unit measures the output level at a fixed period, the input level monitor unit, The input level is measured at the fixed period, and the measurement start timings of the output level monitor unit and the input level monitor unit are the same time .

The span loss monitoring method of the present invention measures the output level of the combined light obtained by combining the wavelength multiplexed signal and the monitoring signal in the monitoring signal transmission device, and detects the output level measurement time which is the measurement time of the output level. , and outputs the multiplexed light to a transmission line, the supervisory signal receiving apparatus, the input level of the multiplexed light input from the transmission path is measured to detect the input level measurement time is the measurement time of the input level and monitoring procedure, in the monitoring signal transmitting apparatus to generate a monitoring signal including a set of the output level measurement time and the output level, and generates a multiplexed light and multiplexes the said monitoring signal and a wavelength-multiplexed signal, In the monitoring signal receiving device, the output level measurement time and the output level included in the monitoring signal of the multiplexed light output to the transmission line in the monitoring procedure Extracted, have a, a monitoring signal generation and span loss calculation procedure for calculating a difference between the input level and the output level at the same time, in the monitoring procedure, the measurement of the output level and the input level is in a constant cycle Yes, the measurement start timing of the output level and the input level is the same time .

The supervisory signal transmission method of the present invention is a supervisory signal transmission method of the supervisory signal transmitter provided in a span loss monitor system in which a supervisory signal transmitter and a supervisory signal receiver are connected by a transmission line, and the wavelength multiplexed signal and the supervisor and outputs to measure the output level of a signal combined the multiplexed light, and an output level monitoring procedure of outputting the multiplexed light to a transmission path, detects an output level measurement time is the measurement time of the output level a time stamp generation step of associating said output level and the output level measurement time, the monitoring signal generation step of generating including monitoring signal pairs of the output level measurement time and the output level associated with the time stamp generation procedure If, possess a multiplexing step of generating a monitoring signal generated by the monitor signal generating procedure and a wavelength-multiplexed signal multiplexed with multiplexed light, wherein the monitoring signal The receiving device receives the combined light from the transmission path, measures an input level of the combined light, detects an input level measurement time that is a measurement time of the input level, and determines the input level measurement time and the input level. Associating and storing, extracting the output level measurement time and the output level included in the monitoring signal of the combined light, calculating a difference between the input level and the output level at the same time, and the output level monitoring procedure The measurement of the output level and the input level is a constant cycle, and the measurement start timing of the output level and the input level is the same time .

The supervisory signal transmission program of the present invention is a supervisory signal transmission program of the supervisory signal transmitter provided in a span loss monitor system in which a supervisory signal transmitter and a supervisory signal receiver are connected by a transmission line, and an output level monitor unit , together with the output level of the monitoring signal and a wavelength-multiplexed signal multiplexed with the multiplexed light is measured and outputting an output level monitoring procedure of outputting the multiplexed light to said transmission line, the time stamp generating unit, the output level detecting an output level measurement time is the measurement time of the Le, a time stamp generation step of associating the output level and the output level measurement time, the monitoring signal generation unit, the output level measurement time associated with the time stamp generation procedure and a monitoring signal generation step of generating including monitoring signal pairs of the output level, the multiplexing unit, the wavelength-multiplexed signal A supervisory signal transmission program for executing a multiplexing procedure for generating a monitoring signal generated by the visual signal generation procedure multiplexed the multiplexed light, to the computer, the monitor signal receiving apparatus, said from the transmission path The combined light is input, the input level of the combined light is measured, the input level measurement time that is the measurement time of the input level is detected, the input level measurement time and the input level are associated and stored, and the combined light The output level measurement time and the output level included in the monitoring signal are extracted, a difference between the input level and the output level at the same time is calculated, and in the output level monitoring procedure, the output level and the input level are calculated. The level measurement is a constant cycle, and the measurement start timing of the output level and the input level is the same time .

The monitoring signal receiving method of the present invention is a monitoring signal receiving method of the monitoring signal receiving device provided in a span loss monitoring system in which the monitoring signal transmitting device and the monitoring signal receiving device are connected by a transmission line, the wavelength multiplexed signal and the monitoring signal. multiplexed light of the signal is inputted from the transmission path, as well as measuring the input level of the multiplexed light, an input level monitoring procedure for detecting an input level measurement time is the measurement time of the input level, contained in the multiplexed light the extraction and supervisory signal termination procedure for receiving the monitor signal, the entering-force level measurement time and in association with the input level stored set of pre Ki監 vision signal emitted Ru contained in the power level measurement time and the output level and, have a, a span loss calculation procedure for calculating a difference between the input level and the output level at the same time, the monitoring signal transmitting apparatus, the wavelength-multiplexed signal Measure the output level of the combined light combined with the monitoring signal, detect the output level measurement time that is the measurement time of the output level, the monitoring signal including the set of the output level measurement time and the output level In the input level monitoring procedure, the output level and the input level are measured at a constant cycle, and the output level and the input level measurement start timing is the same time .

The monitoring signal receiving program of the present invention is a monitoring signal receiving program of the monitoring signal receiving device provided in a span loss monitoring system in which the monitoring signal transmitting device and the monitoring signal receiving device are connected by a transmission line, and the input level monitoring unit includes , multiplexed light of the wavelength-multiplexed signal and the monitoring signal is inputted from the transmission path, as well as measuring the input level of the multiplexed light, an input level monitoring procedure for detecting an input level measurement time is the measurement time of the input level , the monitoring signal termination section, and a supervisory signal termination procedure for receiving the monitoring signal included in the combined light, the span loss calculation unit stores the entering force level measurement time and the input level of the association with the previous Ki監 view extracting a set of output level measurement time and output level Ru contained in the signal, to calculate the difference between the input level and the output level at the same time A supervisory signal receiving program to be executed by the span loss calculation procedure, to the computer, the monitor signal transmitting device measures the output level of the multiplexed light multiplexed by the said monitoring signal and said wavelength multiplexed signal, said An output level measurement time that is a measurement time of the output level is detected, and a monitoring signal including a set of the output level measurement time and the output level is output to the transmission line. In the input level monitoring procedure, the output level and the output level The measurement of the input level is a constant cycle, and the measurement start timing of the output level and the input level is the same time .

  According to the present invention, it is possible to measure the span loss accurately with less human labor.

1 shows an example of a span loss monitor system according to a first embodiment. 2 shows an example of a span loss monitoring method according to the first embodiment. An example of the monitoring signal transmission method which concerns on Embodiment 1 is shown. 2 shows an example of a monitoring signal receiving method according to the first embodiment. The structure of the span loss monitor system which concerns on Embodiment 2 is shown. An example of the calculation result of span loss is shown. The structure of the span loss monitor system which concerns on Embodiment 3 is shown. An example of the monitoring signal receiving method which concerns on Embodiment 3 is shown.

  Embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below are examples of the present invention, and the present invention is not limited to the following embodiments. In the present specification and drawings, the same reference numerals denote the same components.

(Embodiment 1)
FIG. 1 shows an example of a span loss monitor system according to this embodiment. The span loss monitoring system according to the present embodiment includes a monitoring signal transmission device 10 and a monitoring signal reception device 20. The monitoring signal transmission device 10 includes an output level monitoring unit 10-1, a time stamp generation unit 10-2, a monitoring signal generation unit 10-3, and a multiplexing unit 10-4. The monitoring signal receiving device 20 includes an input level monitoring unit 20-1, a monitoring signal termination unit 20-3, and a span loss calculation unit 20-2.

  FIG. 2 shows an example of the span loss monitoring method according to the present embodiment. The span loss monitoring method according to the present embodiment includes a monitoring procedure S100 and a monitoring signal generation and span loss calculation procedure S200.

  FIG. 3 shows an example of the monitoring signal transmission method according to the present embodiment. The monitoring signal transmission method according to the present embodiment includes an output level monitoring procedure S101, a time stamp generation procedure S102, a monitoring signal generation procedure S103, and a multiplexing procedure S104. The monitoring signal transmission program according to the present embodiment is a program for causing a computer to execute an output level monitoring procedure S101, a time stamp generation procedure S102, a monitoring signal generation procedure S103, and a multiplexing procedure S104.

  FIG. 4 shows an example of the monitoring signal receiving method according to the present embodiment. The monitoring signal receiving method according to the present embodiment includes an input level monitoring procedure S201, a monitoring signal termination procedure S202, and a span loss calculation procedure S203. The monitoring signal receiving program according to the present embodiment is a program for causing a computer to execute an input level monitoring procedure S201, a monitoring signal termination procedure S202, and a span loss calculation procedure S203.

  In the monitoring procedure S100 shown in FIG. 2, the monitoring signal transmitter 10 measures the output level of the combined light obtained by combining the wavelength multiplexed signal and the monitoring signal, detects the output level measurement time, and transmits the combined light to the transmission line Output to. Further, the monitoring signal receiving device 20 measures the input level of the multiplexed light input from the transmission line 50, and detects the measurement time of the input level. Specifically, an output level monitoring procedure S101 shown in FIG. 3 and an input level monitoring procedure S201 shown in FIG. 4 are executed.

  In the output level monitoring procedure S101, the output level monitoring unit 10-1 measures and outputs the output level of the combined light from the combining unit 10-4, and outputs the combined light to the transmission path 50. Thereby, the monitoring signal transmitter 10 can transmit the wavelength multiplexed signal and the monitoring signal to the monitoring signal receiver 20.

  In the input level monitoring procedure S201, the combined light of the wavelength multiplexed signal and the monitoring signal is input from the transmission path 50, and the input level of the combined light is measured and the input level measurement time is detected. For example, the input level monitor unit 20-1 receives the combined light of the wavelength multiplexed signal and the monitoring signal from the transmission path 50 and measures the input level of the combined light. Then, the span loss calculation unit 20-2 detects the measurement time of the input level of the input level monitor unit 20-1, and stores the input level measurement time and the input level in association with each other.

  Here, the output level monitoring procedure S101 and the input level monitoring procedure S201 are performed simultaneously. For example, the measurement start timings of the output level monitor unit 10-1 and the input level monitor unit 20-1 are the same time. The output level monitor 10-1 measures the output level at a constant cycle, and the input level monitor unit 20-1 measures the input level at a constant cycle. Thereby, the signal level transmitted by the monitoring signal transmitting apparatus 10 and the signal level received by the monitoring signal receiving apparatus 20 can be measured simultaneously.

  The output level monitor unit 10-1 may measure the output level at a predetermined time, and the input level monitor unit 20-1 may measure the input level at a predetermined time. Thereby, the signal level transmitted by the monitoring signal transmitting apparatus 10 and the signal level received by the monitoring signal receiving apparatus 20 can be measured simultaneously.

  In the monitoring signal generation and span loss calculation procedure S200 shown in FIG. 2, the monitoring signal transmitting apparatus 10 generates a monitoring signal including a set of output level measurement time and output level, and combines the monitoring signal and the wavelength multiplexed signal. To generate combined light. Further, the monitoring signal receiving device 20 extracts the output level measurement time and the output level included in the monitoring signal, and calculates the difference between the input level and the output level at the same time. Specifically, the time stamp generation procedure S102, the monitoring signal generation procedure S103, and the multiplexing procedure S104 shown in FIG. 3 are executed in order, and the monitoring signal termination procedure S202 and the span loss calculation procedure S203 shown in FIG. 4 are executed in order.

  In the time stamp generation procedure S102, the time stamp generation unit 10-2 detects the measurement time of the output level monitoring unit 10-1, and associates the output level measurement time with the output level.

  In the monitoring signal generation procedure S103, the monitoring signal generation unit 10-3 generates a monitoring signal including a set of output level measurement time and output level associated with the time stamp generation unit 10-2.

  In the multiplexing procedure S104, the multiplexing unit 10-4 receives the wavelength multiplexed signal and the monitoring signal, and combines the input wavelength multiplexed signal and the monitoring signal.

In the monitoring signal termination procedure S202, the monitoring signal termination unit 20-3 receives the monitoring signal included in the multiplexed light.
In the span loss calculation procedure S203, the span loss calculation unit 20-2 extracts the output level measurement time and the output level included in the monitoring signal received by the monitoring signal termination unit 20-3. On the other hand, the span loss calculation unit 20-2 reads the stored input level measurement time and input level. Then, the span loss calculator 20-2 calculates the difference between the input level and the output level at the same time.

(Embodiment 2)
FIG. 5 shows the configuration of the span loss monitor system according to the present embodiment. In the span monitor system according to the present embodiment, the upstream WDM device 1 and the downstream WDM device 2 are connected by a transmission path (span A). In the downstream station, the WDM device 2 is connected to the monitoring device 3. In this embodiment, the WDM apparatus 1 of the upstream station functions as a monitoring signal transmission apparatus, and the WDM apparatus 2 of the downstream station functions as a monitoring signal reception apparatus.

  The upstream station WDM device 1 (transmission side) includes an output level monitor 1-1, a time stamp generator 1-2, a monitor signal generator 1-3, a multiplexer 1-4, and a wavelength multiplexed signal generator 1-. 5 and a transmission light amplifying unit 1-6. The WDM apparatus 2 (receiving side) of the downstream station includes an input level monitoring unit 2-1, a span loss calculating unit 2-2, a monitoring signal terminating unit 2-3, a demultiplexing unit 2-4, a received light amplifying unit 2-5, It comprises a wavelength multiplexed signal termination unit 2-6.

  The connection of the upstream station WDM device 1 is as follows. The output of the wavelength multiplexed signal generator 1-5 that generates the wavelength multiplexed signal (main signal) is connected to the input of the transmission optical amplifier 1-6. The output adjusted to an appropriate output level by the transmission light amplifier 1-6 is connected to the input of the multiplexer 1-4. The signal output obtained by combining the monitoring signal from the monitoring signal generation unit 1-3 and the wavelength multiplexed signal from the transmission light amplification unit 1-6 in the multiplexing unit 1-4 is output from the output level monitoring unit 1-1. Connected to input. The signal output of the output level monitor 1-1 is connected to the input of the WDM device 2 of the downstream station via the transmission path 5. The output level monitor value output of the output level monitor unit 1-1 is connected to the input of the time stamp generation unit 1-2. The output of the time stamp generation unit 1-2 is connected to the input of the monitoring signal generation unit 1-3.

  The connection of the downstream station WDM device 2 is as follows. A signal from the WDM apparatus 1 of the upstream station is connected to the input level monitor unit 2-1 through the transmission path 5. The signal output of the input level monitor unit 2-1 is connected to the input of the demultiplexing unit 2-4. The input level monitor value output of the input level monitor unit 2-1 is connected to the input of the span loss calculation unit 2-2. The demultiplexing unit 2-4 separates the wavelength multiplexed signal and the monitoring signal, the wavelength multiplexed signal output is connected to the input of the received light amplification unit 2-5, and the monitoring signal output is connected to the input of the monitoring signal termination unit 2-3. . The output of the received light amplifying unit 2-5 is connected to the input of the wavelength multiplexed signal terminating unit 2-6. The output of the monitoring signal termination unit 2-3 is connected to the input of the span loss calculation unit 2-2.

(1) Operation of Upstream Station (WDM Device 1) The wavelength multiplexed signal generator 1-5 multiplexes the main signal data of each wavelength and outputs it as a wavelength multiplexed signal to the transmission optical amplifier 1-6. The transmission light amplifying unit 1-6 amplifies the output level to an appropriate level so that the wavelength multiplexed signal can be transmitted to the WDM device 2 of the downstream station. On the other hand, the monitoring signal generator 1-3 generates a monitoring signal. Control parameters necessary for controlling the WDM device 2 of the downstream station are inserted into the monitoring signal. The multiplexing unit 1-4 multiplexes the wavelength multiplexed signal (main signal) and the control signal. The output level monitor 1-1 transmits the wavelength multiplexed signal (main signal) and the monitor signal and outputs them to the transmission line, and monitors the output level of the WDM device 1.

  The time stamp generation unit 1-2 adds the date and time information (time stamp information) monitored to the output level value monitored by the output level monitoring unit 1-1 (monitoring cycle t [sec]). The time stamp generation unit 1-2 updates the output level value and date / time information (time stamp information) every t [sec] of the monitor cycle. The monitoring signal generation unit 1-3 superimposes an output level monitor value with a time stamp, which is an output of the time stamp generation unit 1-2, on the monitoring signal. Thereby, the WDM apparatus 1 of the upstream station can transmit the output level value and the date / time information to the WDM apparatus 2 of the downstream station together with other control parameters.

(2) Operation of Downstream Station (WDM Device 2) The wavelength multiplexed signal and the monitoring signal transferred from the WDM device 1 of the upstream station are input to the input level monitor unit 2-1 in the WDM device 2 of the downstream station. The input level monitoring unit 2-1 transmits the wavelength multiplexed signal (main signal) and the monitoring signal and outputs them to the demultiplexing unit 2-4. Further, the input level monitor unit 2-1 monitors the input level of the WDM device 2 and outputs it to the span loss calculation unit 2-2. The demultiplexing unit 2-4 separates the wavelength multiplexed signal and the monitoring signal. The received light amplifying unit 2-5 amplifies the wavelength multiplexed signal (main signal) input from the demultiplexing unit 2-4 to an appropriate level, and outputs the amplified signal to the wavelength multiplexed signal terminating unit 2-6. The wavelength multiplexed signal termination unit 2-6 separates the wavelength multiplexed signal for each wavelength and terminates the wavelength main signal data.

  On the other hand, the monitoring signal separated by the demultiplexing unit 2-4 is input to the monitoring signal termination unit 2-3. The monitoring signal termination unit 2-3 separates the output level monitor value with the time stamp of the upstream station included in the monitoring signal from the parameter for other control, and outputs the output level monitor value with the time stamp to the span loss calculation unit 2- Output to 2.

  The span loss calculator 2-2 adds the monitored date and time information (time stamp information) to the input level value monitored by the input level monitor 2-1 (monitor cycle t [sec]) and holds it. In addition, the output level monitor value with the time stamp of the upstream station input from the monitoring signal termination unit 2-3 is also held. Based on the time stamp information, the span loss calculator 2-2 arranges these monitor values at the same time as shown in FIG. 6 (example of t = 60 sec), calculates the span loss at each time, and holds it for a certain period of time. . If the output level of the upstream WDM device 1 is α [dBm] and the input level of the downstream WDM device 2 is β [dBm], the span loss is calculated as (α−β) [dB].

  The monitoring device 3 arranged in the downstream station can read the table in Table 1 held in the span loss calculation unit 2-2, and the maintenance person can check the span loss as appropriate.

  By superimposing the output level monitor value of the upstream station on the monitoring signal transferred from the upstream station to the downstream station, it becomes possible to calculate the span loss at the downstream station, and the confirmation work of the output level of the upstream station is omitted. Can do.

  The output level monitor value transferred from the upstream station is added with the time (time stamp information) at which the value was monitored. When the span loss is calculated at the downstream station, comparison is made at the input / output level at the same time. Can be performed. As a result, the span loss is measured as a more accurate value.

(Embodiment 3)
FIG. 7 shows the configuration of the span loss monitor system according to the present embodiment. The span monitor system according to the present embodiment has a configuration in which a span loss fluctuation detection unit 2-7 is added between the span loss calculation unit 2-2 and the monitoring device 3 in the WDM device 2 of the downstream station according to the second embodiment. Yes.

  In the span loss monitoring method according to the present embodiment, the difference between the input level and the output level in the monitoring signal generation and span loss calculation procedure S200 shown in FIG. When this is exceeded, an alarm signal is output.

  FIG. 8 shows an example of the monitoring signal receiving method according to the present embodiment. The monitoring signal receiving method according to the present embodiment further includes a span loss variation detection procedure S204 after the span loss calculation procedure S203.

  In the span loss fluctuation detection procedure S204 shown in FIG. 8, the span loss fluctuation detection unit 2-7 generates an alarm signal when the difference calculated by the span loss calculation unit 2-2 exceeds either the upper threshold value or the lower threshold value. Is output.

  For example, the span loss fluctuation detection unit 2-7 holds an upper limit threshold and a lower limit threshold for span loss. The span loss fluctuation detection unit 2-7 constantly monitors the span loss value input from the span loss calculation unit 2-2. When the upper limit threshold value and the lower limit threshold value are exceeded, an alarm is given to the monitoring device 3 as a span loss error. Notice. If the upper threshold value is 15 dBm and the lower threshold value is 23 dBm, an alarm is detected at the date and time “2010: 12: 101: 12: 04: 00” when the span loss is calculated as 25 dBm in the case of FIG. .

  As described above, the WDM device 2 of the downstream station as the span monitoring system and the monitoring signal receiving device according to the present embodiment can monitor the abnormality of the span loss at all times by providing the span loss fluctuation detecting unit 2-7. Become.

(Appendix 1)
A wavelength multiplexing signal and a monitoring signal are input, and a multiplexing unit that combines the input wavelength multiplexing signal and the monitoring signal;
While measuring and outputting the output level of the combined light from the combining unit, an output level monitoring unit for outputting the combined light to a transmission path,
A time stamp generating unit that detects a measurement time of the output level monitor unit and associates the output level measurement time with the output level;
A monitoring signal generation unit that generates the monitoring signal including a set of the output level measurement time and the output level associated with the time stamp generation unit;
A monitoring signal transmission device comprising:
An input level monitor unit that receives the combined light from the transmission line and measures an input level of the combined light;
A monitoring signal termination unit for receiving the monitoring signal included in the combined light;
Detecting the input level measurement time of the input level monitor unit, storing the input level measurement time and the input level in association with each other, the output level measurement time included in the monitoring signal received by the monitoring signal termination unit and A span loss calculator that extracts the output level and calculates a difference between the input level and the output level at the same time;
A monitoring signal receiving device,
A span loss monitor system.

(Appendix 2)
The monitoring signal receiving device is:
Span loss that holds the upper limit threshold or lower limit threshold of span loss and outputs an alarm signal when the difference calculated by the span loss calculation unit exceeds either the upper threshold or the lower threshold The span loss monitoring system according to supplementary note 1, further comprising a fluctuation detecting unit.

(Appendix 3)
The output level monitor unit measures the output level at a constant cycle,
The input level monitor unit measures the input level at the fixed period,
The span loss monitoring system according to appendix 1 or 2, wherein the measurement start timings of the output level monitoring unit and the input level monitoring unit are the same time.

(Appendix 4)
The output level monitor unit measures the output level at a predetermined time,
The span loss monitor system according to appendix 1 or 2, wherein the input level monitor unit measures the input level at the predetermined time.

(Appendix 5)
A wavelength multiplexing signal and a monitoring signal are input, and a multiplexing unit that combines the input wavelength multiplexing signal and the monitoring signal;
While measuring and outputting the output level of the combined light from the combining unit, an output level monitoring unit for outputting the combined light to a transmission path,
A time stamp generating unit that detects a measurement time of the output level monitor unit and associates the output level measurement time with the output level;
A monitoring signal generation unit that generates the monitoring signal including a set of the output level measurement time and the output level associated with the time stamp generation unit;
A monitoring signal transmission device comprising:

(Appendix 6)
The monitoring signal transmission device according to appendix 5, wherein the output level monitoring unit measures the output level at a constant period.

(Appendix 7)
The monitoring signal transmission device according to appendix 5, wherein the output level monitoring unit measures the output level at a predetermined time.

(Appendix 8)
A combined light of the wavelength multiplexed signal and the monitoring signal is input from the transmission line, and an input level monitoring unit that measures an input level of the combined light;
A monitoring signal termination unit for receiving the monitoring signal included in the combined light;
Detecting the input level measurement time of the input level monitor unit, storing the input level measurement time and the input level in association with each other, the output level measurement time included in the monitoring signal received by the monitoring signal termination unit and A span loss calculator that extracts the output level and calculates a difference between the input level and the output level at the same time;
A monitoring signal receiving apparatus.

(Appendix 9)
Span loss that holds the upper limit threshold or lower limit threshold of span loss and outputs an alarm signal when the difference calculated by the span loss calculation unit exceeds either the upper threshold or the lower threshold The monitoring signal receiving apparatus according to appendix 8, further comprising a fluctuation detecting unit.

(Appendix 10)
The monitoring signal receiving apparatus according to appendix 8 or 9, wherein the input level monitoring unit measures the input level at a constant period.

(Appendix 11)
The monitoring signal receiving apparatus according to appendix 8 or 9, wherein the input level monitoring unit measures the input level at a predetermined time.

(Appendix 12)
In the monitoring signal transmission device, measuring the output level of the combined light obtained by combining the wavelength multiplexed signal and the monitoring signal, detecting the measurement time of the output level, and outputting the combined light to the transmission line,
In the monitoring signal receiver, a monitoring procedure for measuring the input level of the combined light input from the transmission path and detecting the measurement time of the input level;
In the monitoring signal transmission device, a monitoring signal including a set of the output level measurement time and the output level is generated, and the monitoring signal and the wavelength multiplexed signal are combined to generate a combined light,
In the monitoring signal receiving device, the output level measurement time and the output level included in the monitoring signal of the multiplexed light output to the transmission line in the monitoring procedure are extracted, and the input level and the output level at the same time are extracted. Monitoring signal generation and span loss calculation procedure to calculate the difference between
A span loss monitoring method.

(Appendix 13)
In the monitoring signal generation and span loss calculation procedure,
13. The span loss according to appendix 12, wherein an alarm signal is output when a difference between the input level and the output level exceeds either a predetermined upper threshold or lower threshold. How to monitor.

(Appendix 14)
14. The span loss monitoring method according to appendix 12 or 13, wherein in the monitoring procedure, the output level and the input level are measured at a constant cycle.

(Appendix 15)
14. The span loss monitoring method according to appendix 12 or 13, wherein, in the monitoring procedure, the output level and the input level are measured at a predetermined time.

(Appendix 16)
Measuring and outputting the output level of the combined light obtained by combining the wavelength multiplexed signal and the monitoring signal, and outputting the combined light to a transmission line;
A time stamp generation procedure for detecting a measurement time in the output level monitoring procedure and associating the output level measurement time with the output level;
A monitoring signal generation procedure for generating the monitoring signal including the set of the output level measurement time and the output level associated in the time stamp generation procedure;
A multiplexing procedure for generating a multiplexed light obtained by multiplexing the wavelength multiplexed signal and the monitoring signal generated in the monitoring signal generation procedure;
A monitoring signal transmission method comprising:

(Appendix 17)
The monitoring signal transmission method according to appendix 16, wherein the output level is measured at a constant period in the output level monitoring procedure.

(Appendix 18)
The monitoring signal transmission method according to appendix 16, wherein the output level is measured at a predetermined time in the output level monitoring procedure.

(Appendix 19)
The output level monitor unit measures and outputs the output level of the combined light obtained by combining the wavelength multiplexed signal and the monitoring signal, and outputs the combined light to a transmission line.
A time stamp generating unit that detects a measurement time in the output level monitoring procedure and associates the output level with the output level measurement time;
A monitoring signal generating unit that generates the monitoring signal including a set of the output level measurement time and the output level associated in the time stamp generating procedure;
A multiplexing unit that generates a multiplexed light obtained by combining the wavelength multiplexed signal and the monitoring signal generated in the monitoring signal generation procedure;
Monitoring signal transmission program for causing a computer to execute.

(Appendix 20)
20. The monitoring signal transmission program according to appendix 19, wherein, in the output level monitoring procedure, the output level monitoring unit measures the output level at a constant period.

(Appendix 21)
The monitoring signal transmission program according to appendix 19, wherein in the output level monitoring procedure, the output level monitoring unit measures the output level at a predetermined time.

(Appendix 22)
A combined light of the wavelength multiplexed signal and the monitoring signal is input from the transmission line, measures an input level of the combined light, and detects an input level measurement time; and
A supervisory signal termination procedure for receiving the supervisory signal contained in the combined light;
The input level measurement time in the input level monitoring procedure and the input level are stored in association with each other, and the set of the output level measurement time and the output level included in the monitoring signal received in the monitoring signal termination procedure is extracted. A span loss calculation procedure for calculating a difference between the input level and the output level at time;
A monitoring signal receiving method comprising:

(Appendix 23)
Span loss that holds the upper limit threshold or lower limit threshold of span loss and outputs an alarm signal when the difference calculated by the span loss calculation unit exceeds either the upper threshold or the lower threshold The monitoring signal receiving method according to appendix 22, further comprising a fluctuation detecting procedure after the span loss calculating procedure.

(Appendix 24)
24. The monitoring signal receiving method according to appendix 22 or 23, wherein the input level is measured at a constant period in the input level monitoring procedure.

(Appendix 25)
24. The monitoring signal receiving method according to appendix 22 or 23, wherein in the input level monitoring procedure, the input level is measured at a predetermined time.

(Appendix 26)
An input level monitoring unit is configured to receive the combined light of the wavelength multiplexed signal and the monitoring signal from the transmission line, measure the input level of the combined light, and detect the input level measurement time;
A supervisory signal termination procedure, wherein the supervisory signal termination unit receives the supervisory signal included in the combined light;
A span loss calculation unit associates and stores the input level measurement time and the input level in the input level monitoring procedure, and sets the output level measurement time and the output level included in the monitoring signal received in the monitoring signal termination procedure. And a span loss calculation procedure for calculating a difference between the input level and the output level at the same time;
Monitoring signal receiving program for causing a computer to execute.

(Appendix 27)
When the span loss fluctuation detection unit holds the upper limit threshold value or the lower limit threshold value of the span loss, and the difference calculated by the span loss calculation unit exceeds either the upper limit threshold value or the lower limit threshold value. 27. The supervisory signal receiving program according to appendix 26, further comprising a span loss fluctuation detecting procedure for outputting an alarm signal after the span loss calculating procedure.

(Appendix 28)
28. The monitoring signal receiving program according to appendix 26 or 27, wherein, in the input level monitoring procedure, the input level monitoring unit measures the input level at a constant period.

(Appendix 29)
28. The monitoring signal receiving program according to appendix 26 or 27, wherein, in the input level monitoring procedure, the input level monitoring unit measures the input level at a predetermined time.

  The present invention can be applied to the information communication industry.

1, 2: WDM device 10: monitoring signal transmitting device 1-1, 10-1: output level monitoring unit 1-2, 10-2: time stamp generating unit 1-3, 10-3: monitoring signal generating unit 1- 4, 10-4: multiplexer 1-5: wavelength multiplexed signal generator 1-6: transmission optical amplifier 20: supervisory signal receiver 2-1, 20-1: input level monitor 2-2, 20- 2: Span loss calculation unit 2-3, 20-3: Monitoring signal termination unit 2-4: Demultiplexing unit 2-5: Received light amplification unit 2-6: Wavelength multiplexed signal termination unit 2-7: Span loss variation detection unit 3 : Monitoring device 5, 50: Transmission path

Claims (9)

A wavelength multiplexing signal and a monitoring signal are input, and a multiplexing unit that combines the input wavelength multiplexing signal and the monitoring signal;
While measuring and outputting the output level of the combined light from the combining unit, an output level monitoring unit for outputting the combined light to a transmission path,
A time stamp generating unit that detects a measurement time of the output level monitor unit and associates the detected output level measurement time with the output level;
A monitoring signal generation unit that generates the monitoring signal including the set of the output level measurement time and the output level associated with the time stamp generation unit;
A monitoring signal transmission device comprising:
An input level monitor unit that receives the combined light from the transmission line and measures an input level of the combined light;
A monitoring signal termination unit for receiving the monitoring signal included in the combined light;
Wherein detecting a measurement time of the input level of the input level monitoring unit, the detected input level measurement time and in association with the input level stored, the output level measurement included in the monitoring signals received in the monitoring signal terminator A span loss calculator that extracts a time and the output level, and calculates a difference between the input level and the output level at the same time;
A monitoring signal receiving device comprising:
I have a,
The output level monitor unit measures the output level at a constant cycle,
The input level monitor unit measures the input level at the fixed period,
A span loss monitoring system in which the measurement start timings of the output level monitoring unit and the input level monitoring unit are the same time . The monitoring signal receiving device is:
Span loss that holds the upper limit threshold or lower limit threshold of span loss and outputs an alarm signal when the difference calculated by the span loss calculation unit exceeds either the upper threshold or the lower threshold The span loss monitoring system according to claim 1, further comprising a fluctuation detecting unit. The monitoring signal transmission device provided in the span loss monitoring system in which the monitoring signal transmission device and the monitoring signal reception device are connected by a transmission line,
The monitoring signal transmitter is
A wavelength multiplexing signal and a monitoring signal are input, and a multiplexing unit that combines the input wavelength multiplexing signal and the monitoring signal;
And outputs to measure the output level of the multiplexed light from the multiplexing unit, and an output level monitoring unit for outputting the multiplexed light to said transmission line,
A time stamp generating unit that detects a measurement time of the output level monitor unit and associates the detected output level measurement time with the output level;
A monitoring signal generation unit that generates the monitoring signal including the set of the output level measurement time and the output level associated with the time stamp generation unit;
Equipped with a,
The monitoring signal receiving device is:
An input level monitor unit that receives the combined light from the transmission line and measures an input level of the combined light;
A monitoring signal termination unit for receiving the monitoring signal included in the combined light;
Detecting the measurement time of the input level of the input level monitor unit, storing the detected input level measurement time and the input level in association with each other, and measuring the output level included in the monitoring signal received by the monitoring signal termination unit A span loss calculator that extracts a time and the output level, and calculates a difference between the input level and the output level at the same time;
With
The output level monitor unit measures the output level at a constant cycle,
The input level monitor unit measures the input level at the fixed period,
A monitoring signal transmission device in which the measurement start timings of the output level monitoring unit and the input level monitoring unit are the same time . The monitoring signal receiving device provided in the span loss monitoring system in which the monitoring signal transmitting device and the monitoring signal receiving device are connected by a transmission line,
The monitoring signal transmitter is
A wavelength multiplexing signal and a monitoring signal are input, and a multiplexing unit that combines the input wavelength multiplexing signal and the monitoring signal;
While measuring and outputting the output level of the combined light from the combining unit, an output level monitoring unit that outputs the combined light to the transmission path;
A time stamp generating unit that detects a measurement time of the output level monitor unit and associates the detected output level measurement time with the output level;
A monitoring signal generation unit that generates the monitoring signal including the set of the output level measurement time and the output level associated with the time stamp generation unit;
With
The monitoring signal receiving device is:
The multiplexed light is inputted from the transmission path, an input level monitoring unit that measures an input level of the multiplexed light,
A monitoring signal termination unit for receiving the monitoring signal included in the combined light;
Wherein detecting a measurement time of the input level of the input level monitoring unit, the detected input level measurement time and in association with the input level stored, the output level measurement included in the monitoring signals received in the monitoring signal terminator A span loss calculator that extracts a time and the output level, and calculates a difference between the input level and the output level at the same time;
Equipped with a,
The output level monitor unit measures the output level at a constant cycle,
The input level monitor unit measures the input level at the fixed period,
A monitoring signal receiving apparatus in which measurement start timings of the output level monitoring unit and the input level monitoring unit are the same time . In the monitoring signal transmitter, the output level of the combined light obtained by combining the wavelength multiplexed signal and the monitoring signal is measured, the output level measurement time that is the measurement time of the output level is detected, and the combined light is output to the transmission line And
In the monitoring signal receiving apparatus, and a monitoring procedure in which the input level of the multiplexed light input from the transmission path is measured, and detects an input level measurement time is the measurement time of the input level,
In monitoring the signal transmission apparatus, generating a monitoring signal including a set of the output level measurement time and the output level, and generates a multiplexed light and multiplexes the said monitoring signal and a wavelength-multiplexed signal,
In the monitoring signal receiving device, the output level measurement time and the output level included in the monitoring signal of the multiplexed light output to the transmission line in the monitoring procedure are extracted, and the input level and the output level at the same time are extracted. Monitoring signal generation and span loss calculation procedure to calculate the difference between
I have a,
In the monitoring procedure, the measurement of the output level and the input level is a constant cycle, and the measurement start timing of the output level and the input level is the same time.
Span loss monitoring method. A monitoring signal transmitting method of the monitoring signal transmitting apparatus provided in a span loss monitoring system in which a monitoring signal transmitting apparatus and a monitoring signal receiving apparatus are connected by a transmission line,
Measuring and outputting the output level of the combined light obtained by combining the wavelength multiplexed signal and the monitoring signal, and outputting the combined light to a transmission line;
Detecting an output level measurement time is the measurement time of the output level, a time stamp generation step of associating said output level and the output level measurement time,
A monitoring signal generating procedure for generating including monitoring signal pairs of the output level measurement time and the output level associated with the time stamp generation procedure,
A multiplexing procedure for generating a multiplexed light obtained by multiplexing the wavelength multiplexed signal and the monitoring signal generated in the monitoring signal generation procedure;
I have a,
The monitoring signal receiving device receives the combined light from the transmission line, measures an input level of the combined light, detects an input level measurement time that is a measurement time of the input level, and detects the input level measurement time and the Associating and storing the input level, extracting the output level measurement time and the output level included in the monitoring signal of the combined light, calculating the difference between the input level and the output level at the same time,
In the output level monitoring procedure, the measurement of the output level and the input level is a constant cycle, and the measurement start timing of the output level and the input level is the same time.
Monitoring signal transmission method. A monitoring signal transmission program for the monitoring signal transmission device provided in a span loss monitoring system in which a monitoring signal transmission device and a monitoring signal reception device are connected by a transmission line,
Output level monitor unit, and outputs to measure the output level of the wavelength-multiplexed signal and the supervisory signal multiplexed with the multiplexed light, and an output level monitoring procedure of outputting the multiplexed light to said transmission line,
Time stamp generating unit detects an output level measurement time is the measurement time of the output level, a time stamp generation step of associating said output level and the output level measurement time,
Monitoring signal generation unit, and the monitoring signal generation procedure a set of power level measurement time and the output level associated with the time stamp generation step for generating a including monitoring signal,
A multiplexing unit that generates a multiplexed light obtained by combining the wavelength multiplexed signal and the monitoring signal generated in the monitoring signal generation procedure;
A supervisory signal transmission program for causing a computer to execute the,
The monitoring signal receiving device receives the combined light from the transmission line, measures an input level of the combined light, detects an input level measurement time that is a measurement time of the input level, and inputs the input level measurement time. Associating and storing the input level, extracting the output level measurement time and the output level included in the monitoring signal of the combined light, calculating a difference between the input level and the output level at the same time,
In the output level monitoring procedure, the measurement of the output level and the input level is a constant cycle, and the measurement start timing of the output level and the input level is the same time.
Monitoring signal transmission program . A monitoring signal receiving method of the monitoring signal receiving device provided in a span loss monitoring system in which a monitoring signal transmitting device and a monitoring signal receiving device are connected by a transmission line,
Multiplexed light of the wavelength-multiplexed signal and the monitoring signal is inputted from the transmission path, as well as measuring the input level of the multiplexed light, an input level monitoring procedure for detecting an input level measurement time is the measurement time of the input level,
A supervisory signal termination procedure for receiving the supervisory signal contained in the combined light;
Stored in association with the entering-force level measurement time of the input level, before extracting the set of Ki監 vision signal Ru is included in the output level measurement time and an output level, and the input level and the output level at the same time The span loss calculation procedure to calculate the difference between
I have a,
The monitoring signal transmission device measures an output level of a multiplexed light obtained by combining the wavelength multiplexed signal and the monitoring signal, detects an output level measurement time that is a measurement time of the output level, and outputs the output level measurement time. And a monitoring signal including the set of output levels to the transmission line,
In the input level monitoring procedure, the measurement of the output level and the input level is a constant cycle, and the measurement start timing of the output level and the input level is the same time.
Monitoring signal reception method. A monitoring signal receiving program of the monitoring signal receiving device provided in a span loss monitoring system in which a monitoring signal transmitting device and a monitoring signal receiving device are connected by a transmission line,
Input level monitoring unit, the multiplexed light of the wavelength-multiplexed signal and the monitoring signal is inputted from the transmission path, as well as measuring the input level of the multiplexed light, detects an input level measurement time is the measurement time of the input level Input level monitoring procedure;
A supervisory signal termination procedure, wherein the supervisory signal termination unit receives the supervisory signal included in the combined light;
Span loss calculation unit, the entering force level measured time and in association with the input level storage, before extracting Ki監 vision signal contained Ru output of power level measurement time and output level set, the input at the same time A span loss calculation procedure for calculating the difference between the level and the output level;
A supervisory signal receiving program for causing a computer to execute the,
The monitoring signal transmission device measures an output level of a multiplexed light obtained by combining the wavelength multiplexed signal and the monitoring signal, detects an output level measurement time that is a measurement time of the output level, and outputs the output level measurement time. And a monitoring signal including the set of output levels to the transmission line,
In the input level monitoring procedure, the measurement of the output level and the input level is a constant cycle, and the measurement start timing of the output level and the input level is the same time.
Monitoring signal reception program .

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